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3 questions
7
votes
1
answer
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Which is better for measuring actual ground elevation, NED or SRTM?
I know that NED DEM layers are created using mainly Lidar point clouds and that the SRTM derives its data from shuttle-based radar. I have both of these loaded into QGIS and can see that over my study ...
- 2,324
2
votes
1
answer
146
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Resolution of NED (National Elevation Dataset)
I downloaded some DEMs from the USGS with a resolution of 1/3 degrees for different areas in the US.
Now I am looking at the files and saw that all DEMs have the same number of columns and rows.
I ...
- 311
6
votes
1
answer
1k
views
Slope analysis from NED data gives crazy histogram? [duplicate]
I'm attempting a simple slope analysis in QGIS2 using the plugin at Raster -> Terrain Analysis -> Slope. The slope output layer has a very strange histogram, basically spikes at 0 and at 89.9098 with ...
- 935